Demand hot water heaters
This is not a solar or environmentally energy harvested technology.
Demand hot water heaters are fueled with petroleum products (propane and natural gas). This product can however save a substantial amount of energy especially when coupled with a solar hot water heater. This provides a very efficient method of heating your hot water.
"Tankless water heaters are [a promising technology] that has significant energy savings potential compared to conventional products. If these products eventually achieve widespread market acceptance, tremendous gains in energy savings and associated pollution prevention could be achieved." ...U.S. Department of Energy, January 2004
It has been estimated that if we all used tankless hot water heaters 91 million tons of carbon dioxide could be kept out of the atmosphere every year.
Demand also called instantaneous or tankless hot water heaters have been in use for more than 50 years in Europe where energy costs are more than twice as high as in North America. The energy consumption of demand hot water heaters is lower than of standby hot water heaters because losses from the storage tank are eliminated. Demand water heaters make the most sense in homes with natural gas or propane available.
The savings are achieved by eliminating standby losses - energy wasted by warmed water sitting around unused in a hot water storage tank. For homes that use 41 gallons or less of hot water daily, demand water heaters can be 24%–34% more energy efficient than conventional storage tank water heaters. They can be 8%–14% more energy efficient for homes that use a lot of hot water—around 86 gallons per day.
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Proper installation depends on many factors. These factors include fuel type, climate, local building code requirements, and safety issues, especially concerning the combustion of gas-fired water heaters. Therefore, it's best to have a qualified plumbing and heating contractor install your demand water heater.
Most demand water heaters have a life expectancy of more than 20 years. They have easily replaceable parts that extend their life by many more years. In contrast, storage water heaters last 10–15 years.
Periodic water heater maintenance can significantly extend your demand water heater's life and minimize loss of efficiency. Read your owner's manual for specific maintenance recommendations.
What are it's Negative Features?
As part our our service in providing a solar water heating system to you we will source and price the most cost effective solution demand based water heater based on your needs.
Links to Demand Hot water heaters
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